you could drill holes in the acrylic pan
fill with sanded cement or plaster of paris.
install water proofing membrane
then tile over
if it were me
I would replace the existing pan with copper pan.
|> I wouldn't bet on it. When the tiles and grout are cracked,
| > even minor water splashes are sucked into the cracks by
| > capilliary action. It doesn't take much to start causing
| > problems, including mold.
| > I really like (nice) tiling. It's attractive and very
| > durable. But if the tiles are not fixed to a really
| > sound, solid surface, it usually ends up a disaster.